Can a DAG Cross Site Bounderies

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S

S Michael Momjian



I am considering adding members to a DAG from two different sites to achieve site resilience. Is this possible?
Background: We have 6 sites two of which are house mailbox servers, hub servers, and client access servers. The choices are as follows:
1) One DAG with 6 servers spanning over two sites.
2) Two DAGs with 3 servers in each site.
Option 1 is preferred as long as DAGs can cross site boundaries. Is Option 1 possible for site resilience?
Thanks

Infrastructure Architect
 
T

Triton.Deep



Yes.

In addition to providing high availability within a datacenter, a DAG can also be extended to one or more other datacenters in a configuration that provides site resilience for one or multiple datacenters. In the preceding example figures, the DAG is located in a single datacenter and single Active Directory site. Incremental deployment can be used to extend this DAG to a second datacenter (and a second Active Directory site) by deploying a Mailbox server and the necessary supporting resources (namely, one or more Active Directory servers, and one or more Hub Transport and Client Access servers), and then adding the Mailbox server to the DAG, as illustrated below.

http://technet.microsoft.com/en-us/library/dd979799.aspx

Jason

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